Rotary-beater mill.



T. I. STURTEVANT.

RGTARY HEATER MILL.

APPLICATION FILED'MAR. I6. 1916.

Patented Feb. 6, 191 7.

v4 SHEETS-SHEET I T. l. STURTEVANT.

ROTARY BEATER MILL.

ARPLlcATloN mio MAR. 16. 1916.

y Patented Feb. 6,1917.

4 SHEETS-SHEET 2.

T. 1. STURTEVANT.

ROTARY BEATER MILL.

APPLICATION FILED MAR.16. me.

Patented Feb. 6, 1917.

4 SHEETS-SHEET 3.

TJ 32a/126@ van! attorney, S

T. l. STURTEVANT.

ROTARY BEATER MILL.

APPLICATION FILED MAR. I6. 191e.

Lm. Patented Feb. 6,1917.

4 SHEETS-SHEET 4.

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op d! 90 @Horne 115 THOMASJOSEPH sastra'riwanr,V or WELLESLEY, Massaonnsnrrs, .assitance 'ro STURTEVANT MILL COMPANY, A CORPORATION or Ian-Inn.

ROTARY-annalisa MILL.

Specification of Letters Patent.

Patented Feb., 8, 12H91?.

Application filed March 16, 1916. Serial No. 84,503.

f To all whom it may concern.'

"at Wellesley, in the county of Norfolk and State of Massachusetts, have invented or dis covered certain new and useful lfmprovements in Rotary-Beater Mills, of which the following is a specification, referencev being had therein to the accompanying drawings;

'llhis invention relates to that class of crushing mills employing rotary swinging hammers or beaters which are carried by heads attached to rotary shafts, and which rotary hammers or beaters may have pivotal connections with Said heads so that they are free to swing, more or less, independently of the shafts, as the latter are rotated carrying the hammers or beaters around with them. These rotary hammers or beaters coperate with linings with which the mill casings are provided, and as the efficiency of this style of mill is due largely to the closeness with which the hammers or beaters run to the linings or interior casing parts it is desirable to provide for adjustments of the rotary ham mers or beaters relative to the linings or inside casing parts, so as to compensate for wear. In machines of this kind it has been customary to provide for the adjustments of the rotary hammers or beaters, relative tothe heads or parts by which they are carried, either by radial adjustments of the pivot pins on which the rotary hammers or beaters are mounted, or by providing the heads with differently located holes in which the pivot pins can be mounted at varying distances' from the centers of rotation of the shafts. The present invention has for its object to provide for a more convenient and efficient adjustment of the rotary hammers or beaters relative to the linings or inside casing parts; for the purpose of compensating for wear or for varying the output of the mills, as is sometimes desirable with different kinds of material being reduced. This object is effected, in accordance with the present invention, by providing for relative adjustments of the rotary hammers or beaters Vand casing parts by an Jendwise or longitudinal movement 'of'one or the other of these parts, as will hereinafter more fullyV appear, insteadof by radial adjustments of the hamme-rs or beaters, as has heretofore been done.

In the accompanying drawings Figure lis a vertical longitudinal section of a horizon! tal style of rotary beater mill embodying the present invention. Figs. 2 and 3 are end views of the same, looking from the right `and left, respectively, of Fig. l. Fig. 4L is a transverse section of the same, on line 4 1, of Fig. 1. Figs. 5 and 6 are detail views of a preferred form of liner for the mill casing. Fig. 7 is an elevation of a vertical style of rotary beater mill embodying the present invention, Fig. 8 isla central vertical section of the same on line 8 8, Fig. 7 Fig. 9 is a plan viewof the mill sho-wn in Figs. 7 and 8, and Fig. 10 shows a modified form of vertical mill embodying the present invention.

Referring to Figs. l to 6 of the drawings, illustrating the horizontal style ofmill embodying the present invention, 12 denotes the fra-me or standard portion of the mill which is provided with bearings for the rotary shaft 18 providedv with a suitable driving pulley 14. The frame or standard portion 12 of the mill is formed partly hollow affording a mill chamber, and bolted to the said frame portion or standard is an upper casing, affording theupper portion of the mill chamber,`said `upper casing comprising parts 15, 16 and 17. The mill chamber in its preferred form comprises a cylindrical portion partially formed by the casing part 16, and a. conical portion partly formed by the casing part 17. Attached to the rotary shaft 13 are hea'ds 18 in which are mounted pivot pins or bars 19 carrying circular sets of rotary swinging hammers or beaters 20 and 21, any

desired number of which may be employed. The rotary beaters 20 are of a straight form, that is to say .they have outer faces which are straight, or approximately so, while the outer faces of the rotary beaters 21 are formed tapered or outwardly flaring aording inclined faces to cooperate with the lin- .ings of the conical portion of the mill chamber. The cylindrical portion of the mill chamber is preferably provided with spiral or inclined corrugated liners 22 acting as stationary grinding elements, in cooperation with the swinging hammers or beaters, and which will serve to increase or retard the feed or longitudinal movement of the material being reduced according to the direction of rotation of the shaft 18 or the deflection to the right or left of the corrugations as the said material moves from the cylindrical portion of the chamber' into ywhich it is .beaters 21 inthe conical portions of the mill chamber and the inclined corrugated liners 25 coperating therewith, are preferably formed in steps, so that anendwiseadjustment of the shaft 13, with which the beaters are connected, will move' certain portions of the working faces of the beaters nearer to or farther from certain cooperating portions of the liners," as will be readily understood from Fig. l. This endwise adjustment of the shaft 173 is effected by means of an adjusting screw 26 mounted ,in a portion l2l of the frame, said adjusting screw having a swiveled coupling connection 27 W1th the,y

shaft 13. The said screw may be adjusted endwise by means ofnuts mounted thereon on opposite sides of the frame portion 12a, said nuts being provided with hand wheels 28 for the purpose of turning the said nuts inV adjusting the screw and 1n locking the screw in any desired position when adjusted. From the foregoing it will be apparent that an endwise or longitudinal adjustment of the shaft 13, with which the rotary Kswinging hammers or beaters are connected will vary the positions of the beaters 21 relative to the liners 22 with which they coperate, for the purpose of taking up wear or for varying the fineness of the output of the material being crushed.

It will be noted that the material to be crushed is entered into the cylindrical por-i are of such construction that different parts" of their free ends work in circles of different radii.

Referring to Figs. 7, 8 and 9, which illustrate the present invention embodied in a vertical form of crushing mill, 30 denotes a base from which rises standards 31 which support the bottom portion' 32 of the mill casing. The' body of the casing comprises two similar upri ht members or halves which collectively orm a conical casing portion 17 and a cylindrical casing portion 16,.

upright casing members are further connected with each other by means of a vertical pivot postI 33 which passes through ears 34 and arms 36 projecting from said members. This affords what may be called an open door construction, in'that either of the upright casing members may be unbolted from the other and from the bottom 32 and top 45 and swung horizontally about the post 33 as a pivot and upon 'the other casing member as a support, thereby affording convenient access to Ithe 4interior of the mill whenv necessary. In the verticalmill construction herein shown the-feed openingy or hopper 23, which is at the upper end of the mill casing, and which communicates with the cylindrical part of the mill chamber, is

formed on one of the swinging parts of the mill casing, while the discharge opening 24 is formed on the bottom portion 32 and is preferably located on the opposite side of the mill casing from said hopper.

The upright rotary shaft 37 is stepped in a bearing box 38 supported by a lever 39 pivoted at one end tothe base 30, the other end of said lever being connected with an adjusting" screw 40 encircled by a nut- 41 bearing on the' base 30 and provided with a hand wheel 42 ,which may be turned for)the purpose of adjustingthe said shaft 37 vertically. The shaft 37 is provided, as usual, with ay driving pulley 43, and has a bearing at its upper end in a sleeve 44 supported at the top Yof the mill casing. Splined to said shaft 37 are heads 18 in the ianges of which aremounted pivot-pins 19 o n which the ro tary hammers or beaters 20 and 21A are inturn mounted so that they' are free to swing on these pivot-pins as they are carried around with the rotary heads splined to the shaft 37. Coperating with the rotary .ham,

mers or beaters 20 and 21 are corrugated liners 22a and 25a, the latter being inclined so as to"coperate with the inclined workingi faces of the rotary beaters or hammers 21.

Fig. 10 shows another form of vertical mill embodying the present invention. 'In this form of mill most of the partsv are similar to those of the style of milly shown in Fig. 8 and are similarly designated by reference numerals. The casing of .this mill, however, is of double conical form affording a double conical mill chamber. The upper part of the casing and the swinging hammers or beaters 21 coperating therewith are similar to those in the lower part of the mill shown in .F ig. 8, and the head 18 carrying these symging hammers or beaters 21 is fixed to t e shaft 37 so as to be adjustable vertically therewith. The swinging hammers or beaters 21", working in the lower conical part 17'L of the mill casing, are, however, carried by a head 18a which is splined to the shaft 37 soas to rotate therewith,I but which is adjustable independently of said f 'Lamme shaft by means ofthe' lever 39, supporting said head 18a, said lever being adjustable by means'similar to those by which the lever 39, supporting the shaft '37, is adjustable. The head 18a rests on a plate 45 which, in turn', rests on'ball bearings 46 in 'a box 47 attached to the adjusting lever 39a, this construction enabling the head 18a to rotate freely independently ofA the lever 39a by Vwhich it is supported.

From the `foregoing it will be apparent that by turning .the nut 4l by the hand wheel 42 thel shaft 37 and the rotary hammers or beaterst connected ltherewith may Ybe adjusted vertically for the purpose of talcin'g up wear orV varying the distance between the inclined outer faces of the rotary hammers or beaters 21 and the inclined corrugated linings with which` they coperate.

It willthus be seen that a variation of the, distance between the working faces of the A rotary beaters or hammers andthe corru' gated liners with which they cooperate is effected by what may be termed a longitudinal adjustment, or an adjustment in the line of the axis of the shaft carrying the Vrotary beaters or hammers. This is in contradistinction to the radial adjustments of the rotary hammers or. beaters heretofore provided, and these longitudinal adjustments may be much more easily effected than the radial adjustments provided for `by prior constructions, and by simpler means.` The invention 1s,.however, not toy be considered as being limited to the details-herein shown,

or to the particular means by which these longitudinal adjustments may be effected.

For example, instead of adjusting the ro' tary hammers or beaters longitudinally rela'- tive to the casings or^liners,such adjustment might be effected by a reversal of this construction whereby the casings orliners would be made adjustable relative to the beaters. Also the longitudinal-adjustment might be effected in other ways than 'by .shifting the shaft with which theJ rotary hammers or beaters are connected, j as` by shifting the heads longitudinally ontheshaft, as shown in'Fig. 10,101'y by' shifting the `hammers or beaters longitudinally on` the heads; or, less. preferably,'from a me-a chanicalstandpoint, by shifting the casing.

longitudinally relative tothe hammers or beaters, as justabove stated.

-While a yconical form of casing is preferred to coperate with the .adjustable beaters in varying the distance between the working faces of thebeaters or liners of the ceasing, it will be understood that differentv forms of casingsg might .be employed, for

the purpose of taking"--p wear of the beaters, inshifting the latter longitudinally. The preferred construction herein shown land* described affords a mill in which the the hopper 23 .can 'pass freely through the mill as it\ is reduced, and the liability of clogging, which frequently occurs in the operation of rotary beater mills provided with grate bars, is entirely avoided in this improved style of mill.l

It wilbbe observed that the means herein shown` for adjusting the rotary beaters is such as td permit the adjustment ofy these parts even when the Inill is in operation.

Having thus described my invention I` claim and desire to secure by Letters Patent'zl. In .a` crushing mill, the combination with a rotary sha t and pivoted swinging beaters connected therewith and having inclined outer or working faces, of a casing part affording a reducing chamber, corrugated liners .within said casing partv and having inclined faces formed in. steps, and means, flocated outside ofthe mill casing,

foradjusting the said beaters longitudinally of said chamber for the purpose of varying the space between said beaters and liners.`

J 2. In a crushing mill, the combination with a rotary shaft and pivoted swinging hammers or beaters connected therewith inclined relative .to the axis of sa d shaft, of casing parts affording a mill ch ber, cooperating stationary corrugated liners also inclined relative tothe axis`of said shaft, and means for adjusting saidshaft longitu- 'and the outer 'ends orfaces of ich are dinally 4of said chamber while the mill is running, for the purpose of taking up wear or'varyingthe distance between the outer Working ends' or faces of said hammersor beaters ,and said liners.

3. In a rotary beater mill, the combina tion with a milltasing and a rotary shaft, of

pivoted swinging hammers or beaters ear-V -fried thereby, the working endsor faces of said hammers'or beaters'being` inclined'relative to the axis'- of said shaft, corrugated liners in said casing and also inclined rela.

'tive tothe axis'of said shaft, a flaring casingincreasing indiameter "toward the ou`t- 4-let part of the mill and the working faces of i said beaters increasingl in distance from said shaft tpwardfthe outlet part of the mill. 4.1,In av rotary beater mill, the combination with a rotary shaft and two sets pf pivoted swinging hammers obeaters carried thereby, a` casing part, V:fr )rming the mill chamber, having cylindrical and conical portions, said conical portion flaringtoward the outletipart of the mill, one set of said hammers or beaters working in said cylindrical portion and the other set of said hammers or beaters working in said-conical portion,

the last-named hammers or beaters having inclined faces flaring outward Z.from said shaft toward the outlet part of the mill.

5. A rotary beater pulverizing mill havinga casing providing a reducing chamber which is partly cylindrical and partly conical, a set of pivoted beaters working in each jpartly cylindrical Jand partly conical, the

cylindrical part of said casing being provided Lwith a hopper or feed opening, and the conical portion of said casing having a discharge opening at its largest end, combined with a rotary shaft within said casing, a set of pivoted hammers or beaters rotating i with said shaft in each of the casing parts,

and mechanical vmeans to cause the material, in process of reduction to have a general longitudinal movement within said casing between said hopper or feed opening and said discharge opening.

l, 7. In a rotary beater mill, the combination with` a suitable casing, hinged orpivoted hammers lor beaters mounted to rotate within the same and having inclined outer ends or faces, a shaft by which said beaters are carried, and corrugated liners within said casing and having. faces which are inclined .to correspond 4to the inclined working ends or faces of said beaters,

the corrugations of said liners being inclined t relative t`o the said shaft'in the direction of the rotation of said shaft, to cause the material being reduced to have a general longitudinal movement in' the chamber of the mill. 8. In a rotary beater mill, the cembination with a mill casing having@J conical portion flaring toward its discharge end and provided with liners formed in steps, of a circular seriesof hinged or pivotederotary hammers or. beaters having inclined working faces also formed m steps and mcreasing in radial `extent/toward the said discharge end of said casing.

9. Avertical rotary beater millcompris- -ing an upright shaft, pivotally `mounted swingingfhammers o-r beaters connected`T with said shaft to rotate therewith', and a casing affording a mill 4chamber within which the said swinging hammers or beati ers work, sald casing 1ncreas1ng ln-dlameter toward its bottom or discharge end, and said hammers or beaters increasing in radial extent toward said bottom or discharge end.

10. A vertical rotary beater mill comprising an upright shaft, pivotally mounted swlnglng hammers or beaters connected with said shaft to rotate therewith, and a casing affording a mill chamber within lwhich the said swinging hammers or beaters work, said casing inceasing'in diameter toward its bottom and being provided at o'r near its top with a feed opening, and at or near its bottom with a .discharge opening, and said hammers or beaters increasing i radial extent downward. ,l p 11. In a crushing mill, the combination with a circular casing, of a rotary shaft axially disposed in said casing, pivotally mounted yielding hammers or beaters connected to said shaft to rotate therewith, liners in said casing serving, in cooperation with said hammersy or beaters, as stationary crushing elements, and closely adjacent to which. the working faces of said hammers or beaters run, and means for varying the relative positions of the working 'faces ofsaid hammers or beaters and said liners. 12. In a crushing mill, the combination with a circular casing a portionof which is conical, of a rotary shaftjaxially. disposed in said casing, pivotally mounted yielding Y hammers or beaters connected to said shaft to rotate .therewith andlhaving inclined Working faces, liners in said casing serving, in coperation with said hammers or beaters,

`as stationary crushing elements, and closely adjacent to which the working faces of said hammers or beaters run, and means for varying therelative positions of the working faces of said hammers or beaters and said liners.

13. In a crushing mill, the combination axially disposed in said casing, pivotally mounted yielding hammers or beaters concasing serving, in rcovpleration with said with a verticalcircular casing a portion of which is conical, of a vertical rotary shaft.

hammers or beaters, as stationary crushing v elements, and closely adjacent to which the v,

working faces of said hammers or beaters run, and means for adjustingsaidfshaft' vertically for thepurpose of varying the relativepositions of the working faces of said hammers or beaters-and said liners.

14. In a rotary beater mill, the combination withv a vertical mill casing provided with stationary reducing elements, of a vertical shaft in said casing, and horizontally disposed, pivoted rotary beaters carried by said shaft and between the ends of which beaters and said coperating stationary elements the material is reduced, said casing being provided'at its top at one side with a feed hopper so a's to enter thematerial to lgated crushing elements cooperating with said horizontally swinging beaters; Whereby material to be reduced may be entered at the top of the mill and will be successively .subjected to the coperative action of the several sets of beaters and stationary crushing elements as it passes from the top to the bottom of the mill chamber.

In testimony whereof l alix my signature. 20

THOMAS JosEPH STURTEVANT. 

